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Debt - Narrative (Details) - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
May 04, 2020
Apr. 14, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Dec. 13, 2019
Line of Credit Facility [Line Items]              
Maximum borrowing capacity             $ 150,000
Weighted average interest rate on debt       0.70%      
Debt issuance costs             2,600
Proceeds from long-term debt       $ 119,018 $ 0 $ 0  
Debt Instrument [Line Items]              
Proceeds from long-term debt       119,018 0 0  
Repayments of long-term debt       $ 55,893 $ 0 $ 0  
Paycheck Protection Program loan              
Line of Credit Facility [Line Items]              
Proceeds from long-term debt   $ 9,000          
Debt Instrument [Line Items]              
Proceeds from long-term debt   $ 9,000          
Repayments of long-term debt $ 9,000            
LIBOR | Maximum              
Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate     3.25%        
LIBOR | Minimum              
Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate     1.25%        
Term loan              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity             50,000
Revolving loan              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity             $ 100,000
Year one | Term loan              
Line of Credit Facility [Line Items]              
Amortization percentage of quarterly installments             5.00%
Year two | Term loan              
Line of Credit Facility [Line Items]              
Amortization percentage of quarterly installments             5.00%
Year three | Term loan              
Line of Credit Facility [Line Items]              
Amortization percentage of quarterly installments             7.50%
Year four | Term loan              
Line of Credit Facility [Line Items]              
Amortization percentage of quarterly installments             7.50%
Year five | Term loan              
Line of Credit Facility [Line Items]              
Amortization percentage of quarterly installments             10.00%